GM Service Manual Online
For 1990-2009 cars only

Communication Interface Module Scan Tool Data Parameters

Parameter

Operating Conditions

Expected Value

Definition

Ignition is ON, engine OFF, and vehicle is stationary

Date

--

Numeric

This displays DD/MM/YYYY. This is the date the VCIM was manufactured.

GPS Signal

--

Yes

The scan tool displays Yes or No. Yes is displayed if there is a GPS signal received by the VCIM.

Signal Strength

--

68

The scan tool displays 0-100. This is the VCIM signal strength.

Signal Type

--

Digital

The scan tool displays Digital or Analog. This is the signal type received by the VCIM.

Time

--

Numeric

The scan tool displays HH:MM:SS. This is the current time.

Transceiver ID

--

Transceiver ID

The scan tool displays a 2-5 digit value. This is the transceiver identification number.

Communication Interface Module Scan Tool Output Controls

Parameter

Operating Conditions

Definition

Ignition is ON, engine OFF, and vehicle is stationary

B1000 Data

--

This shows the data recorded when DTC B1000 was set in the VCIM.

Green LED

--

The VCIM illuminates the green LED on the inside rearview mirror when ON is selected.

Phone Call Test

--

When ON is selected, VCIM commands OnStar® to the OnStar® center.

Preferred Roaming List (PRL) Update

--

The VCIM performs a preferred roaming list (PRL) update when this is selected.

Red LED

--

The VCIM illuminates the red LED on the inside rearview mirror when OFF is selected